What are Joins in SQL? #3631
What are Joins in SQL?
#3631
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What are Joins in SQL? |
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Answered by
NadeeshaMedagama
Jun 28, 2026
Replies: 1 comment
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Joins combine data from multiple tables based on a related column. INNER JOINReturns only matching records. Example Customers
ID | Name
-- | --
1 | John
LEFT JOINReturns all rows from the left table and matching rows from the right table. RIGHT JOINReturns all rows from the right table and matching rows from the left table. FULL OUTER JOINReturns all rows from both tables, matching where possible. Interview TipINNER JOIN is the most commonly used join in backend applications. |
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Answer selected by
janedoe2026
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Joins combine data from multiple tables based on a related column.
INNER JOIN
Returns only matching records.
Example
Customers
LEFT JOIN
Returns all rows from the left table and matching rows from the right table.
RIGHT JOIN
Returns all rows from the right table and matching rows from the left table.
FULL OUTER JOIN
Returns all rows from both tables, matching where possible.
Interview Tip
INNER JOIN is the most commonly used join in backend applications.